The Oppo F31 is a battery-focused 5G Android phone from OPPO’s F series, pairing a 7000mAh silicon-carbon battery with 80W wired charging and a slim 8 mm body.
Its specification sheet is aimed at buyers who want a practical mid-range phone with a bright AMOLED display, current 5G support, expandable storage, and stronger-than-usual dust and water resistance.
Full Specifications
Network
| Technology: | GSM / HSPA / LTE / 5G |
| 2G bands: | GSM 850 / 900 / 1800 / 1900 |
| 3G bands: | HSDPA 900 / 2100 |
| 4G bands: | 1, 3, 5, 8, 19, 28, 38, 40, 41, 42, 48 |
| 5G bands: | 1, 3, 5, 8, 28, 38, 40, 41, 77, 78 SA/NSA |
| Speed: | HSPA, LTE, 5G |
Launch
| Announced: | 2025, September 17 |
| Status: | Available. Released 2025, September 27 |
Body
| Dimensions: | 158.2 x 75 x 8 mm (6.23 x 2.95 x 0.31 in) |
| Weight: | 185 g (6.53 oz) |
| SIM: | Nano-SIM + Nano-SIM |
| IP68/IP69 dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min) MIL-STD-810H compliant* * does not guarantee ruggedness or use in extreme conditions |
Display
| Type: | AMOLED, 1B colors, 120Hz, 600 nits (typ), 1400 nits (HBM) |
| Size: | 6.57 inches, 105.0 cm2 (~88.5% screen-to-body ratio) |
| Resolution: | 1080 x 2372 pixels (~397 ppi density) |
| Protection: | AGC DT-Star D+ |
Platform
| OS: | Android 15, ColorOS 15 |
| Chipset: | Mediatek Dimensity 6300 (6 nm) |
| CPU: | Octa-core (2×2.4 GHz Cortex-A76 & 6×2.0 GHz Cortex-A55) |
| GPU: | Mali-G57 MC2 |
Memory
| Card slot: | microSDXC |
| Internal: | 128GB 8GB RAM, 256GB 8GB RAM |
| UFS 2.2 |
Main Camera
| Dual: | 50 MP, f/1.8, (wide), PDAF Auxiliary lens |
| Features: | LED flash, HDR, panorama |
| Video: | 1080p@30/60/120fps |
Selfie camera
| Single: | 16 MP, f/2.4, (wide) |
| Features: | Panorama |
| Video: | 1080p@30fps |
Sound
| Loudspeaker: | Yes, with stereo speakers |
| 3.5mm jack: | No |
Comms
| WLAN: | Wi-Fi 802.11 a/b/g/n/ac, dual-band |
| Bluetooth: | 5.4, A2DP, LE, aptX HD |
| Positioning: | GPS, GALILEO, GLONASS, BDS, QZSS |
| NFC: | No |
| Radio: | Unspecified |
| USB: | USB Type-C 2.0, OTG |
Features
| Sensors: | Fingerprint (under display, optical), accelerometer, proximity, compass |
Battery
| Type: | Si/C Li-Ion 7000 mAh |
| Charging: | 80W wired, 33W PPS, 13.5W PD Reverse wired charging |
Misc
| Colors: | Midnight Blue, Bloom Red, Cloud Green |
| Models: | CPH2781 |
| SAR: | 1.18 W/kg (head) 0.81 W/kg (body) |
| Price: | ₹ 24,999 |
Price and Availability
The Oppo F31 offers a compelling combination of features and performance. While the base price is around ₹24,999, the actual cost may vary depending on your location and retailer. Below, you’ll find the approximate price of the Oppo F31 converted into various currencies. Please note that these are estimates based on recent exchange rates as of August 8, 2026 and may not reflect the exact price you’ll find at a retailer.
- United States: $262
- Japan: ¥41,446
- United Kingdom: £195
- Australia: A$372
- Canada: C$367
- Taiwan: NT$8,450
- Denmark: kr1.696
- Saudi Arabia: ﷼984
- South Korea: ₩370,544
- Germany: €227
- Brazil: R$1.341
- Vietnam: ₫6.886.123
- Kenya: KSh 33,927
- India: ₹24,999
- Indonesia: Rp 4.688.607
- Nigeria: ₦358,382
- Pakistan: ₨72,927
- Philippines: ₱15,974
- Bangladesh: ৳৩২,৫০০
Value Position
The Oppo F31 stands out by putting battery capacity, charging speed, and durability near the top of the package. Instead of chasing flagship camera hardware or premium chip performance, it focuses on everyday dependability, long runtime, and a modern display experience.
Design and Durability
At 185 g and 8 mm thick, the phone stays relatively manageable considering its large 7000mAh battery. The IP68/IP69 rating adds protection against dust, immersion, and high-pressure water jets, while the MIL-STD-810H compliance note should be read carefully: it does not make the phone guaranteed for extreme conditions.
Display Experience
The 6.57-inch AMOLED panel is one of the stronger parts of the spec sheet. A 120Hz refresh rate, 1 billion colors, 1080 x 2372 resolution, and up to 1400 nits in high-brightness mode should make it well suited for scrolling, media, and outdoor visibility.
Performance and Storage
The MediaTek Dimensity 6300 is a 6 nm 5G chipset built for efficient daily performance rather than heavy flagship workloads. With 8GB RAM, UFS 2.2 storage, and a microSDXC card slot, the Oppo F31 should handle common apps, streaming, messaging, and multitasking comfortably.
Camera Setup
The rear camera system is simple: a 50 MP wide camera with PDAF plus an auxiliary lens. It covers the basics with HDR, panorama, LED flash, and up to 1080p video at 30, 60, or 120fps, while the 16 MP front camera is mainly designed for selfies and video calls.
Battery and Charging
The 7000mAh Si/C Li-Ion battery is the headline feature. Combined with 80W wired charging, 33W PPS, USB-C charging support, and reverse wired charging, the Oppo F31 is better suited to long days than many slimmer mid-range phones.
Software and Security
The phone ships with Android 15 and ColorOS 15. Security and convenience are handled by an under-display optical fingerprint sensor, joined by common motion and orientation sensors including an accelerometer, proximity sensor, and compass.
Connectivity Notes
Network support includes GSM, HSPA, LTE, and 5G with SA and NSA bands listed for India-focused use. Wi-Fi ac, Bluetooth 5.4 with aptX HD, multi-system satellite positioning, USB Type-C 2.0 with OTG, and stereo speakers are included, but NFC and a 3.5 mm headphone jack are not listed.
Who Should Buy the Oppo F31?
The Oppo F31 makes the most sense for buyers who prioritize battery life, fast charging, AMOLED smoothness, expandable storage, and stronger ingress protection. Users who need advanced ultrawide or telephoto cameras, NFC payments, or flagship gaming performance may want to compare alternatives before choosing it.
Conclusion
The Oppo F31 is a practical 5G phone built around endurance, display quality, and durability rather than camera variety or top-tier performance. It is a strong pick for battery-first Android buyers who want a balanced daily phone with modern essentials.
References
- OPPO India – OPPO F31 5G Specifications – Primary source for the Oppo F31 5G model CPH2781 full hardware specifications, including display, cameras, battery, chipset, bands, dimensions, sensors, and software.
- OPPO India – OPPO F31 5G Product Page – Official product page for feature claims such as 7000mAh battery, 80W SUPERVOOC charging, 120Hz AMOLED display, durability ratings, and design/color options.
- OPPO India – F31 5G Series Launch Press Release – Official launch announcement confirming the F31 series lineup, India launch context, processor choices, storage variants, battery, charging, OS, durability, and update claims.
- MediaTek Dimensity 6300 Official Product Page – Primary chipset reference for the Oppo F31 5G SoC, CPU/GPU configuration, memory and storage support, display capability, camera support, and 5G connectivity features.
- OPPO Global – Declaration of Conformity – Official OPPO certification page listing model CPH2781, useful for verifying regulatory and conformity documentation tied to the device model.
